Or perhaps, given they are educated and independent women, you have an incredibly ignorant and prejudiced view of black women, who are capable of understanding the complexities of gender relations as much (hey, maybe more?) than you do?
This is completely irrelevant to the point being debated.
The Caledonian Sleeper offers single sex segregated accommodation for those who want to share but in reality are offerring accommodation based on self- declared gender.
Personally this does not affect me- sharing with any stranger is a non-starter (and personally I also think some of the " a trans woman might hear me unwrap a tampon so we can't have unusex toilets " arguments on FWR are ridiculous) but even I get this point.